I think sub species would be better if (I know they are limited by the building) you were surrounded by doors in the first room, and lots of people get dragged a different way. I thought the tunnel had far more potential. After seeing one actor who load me to go th other way, there weren't any others in the tunnel. Even having material that brushes your face as you crawl through, or a sound on the outside that sounds like someone is hitting it would improve it. Also, I would prefer it if (I know some people wouldn't like it) but if too many people were in a group at one time (like at the start, if only a few people are taken through other doors, lots of people end up together in the next room) the actors can split you up some how, by keeping some of your group back or taking them a different way. The ending was amazing, possibly the most scared I've ever been, but I'd like the ending to be changed for next year (although the chainsaw to feature in the maze at some point), and not to have the alternate endings, as one will inevitably be weaker. At one point towards the end of the maze (either before or after the tunnel, I can't remember) I saw quite a lot of sunlight coming through the side of the shipping container which didn't help portray that you are in a sewer. The body on the stretcher at the end could be better used, by being across the path so you have to walk close to it, and if it wasn't constantly moving - if it only moved if someone was next to it.
Really hoping it will return though, defiantly the strongest maze this year.